Physics is like sex: sure, it may give some practical results, but that's not why we do it.
Science is a way of thinking much more than it is a body of knowledge.
The man who is fond of books is usually a man of lofty thought, and elevated opinions.
There is no authority who decides what is a good idea.
Reading without reflecting is like eating without digesting.
Books are as useful to a stupid person as a mirror is useful to a blind person.
Those who fail to learn the lessons of history are doomed to repeat them.
My weapon is literature
The progressive development of man is vitally dependent on invention.
I think that kids have a greater capacity for processing things than we give them credit for.
If there were no bad people, there would be no good lawyers.
If you're teaching today what you were teaching five years ago, either the field is dead or you are.
In mathematics you don't understand things. You just get used to them.
Industrialize or perish.
When I am attacked by gloomy thoughts, nothing helps me so much as running to my books. They quickly absorb me and banish the clouds from my mind.
Study without desire spoils the memory, and it retains nothing that it takes in.
Science is not only a disciple of reason but, also, one of romance and passion.
I do not know how to teach philosophy without becoming a disturber of the peace.
I cannot live without books.
What is now proved was once only imagined.
Never help a child with a task at which he feels he can succeed.